package com.atheima.reggie.filter;

import com.atheima.reggie.common.BaseContext;
import com.atheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;
import com.alibaba.fastjson.JSON;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}",request.getRequestURI());

        log.info("过滤器线程id: {}",Thread.currentThread().getId());

        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/common/**",
                "/user/**",
                "/front/**"
        };
        //2、判断本次请求是否需要处理
        boolean check = check(urls, requestURI);
        if(check) {
            filterChain.doFilter(request,response);
            return;
        }
        Object employeeId = request.getSession().getAttribute("employeeId");
        if(employeeId != null) {
            BaseContext.setCurrentId((Long) employeeId);
            filterChain.doFilter(request,response);
            return;
        }
        Object userId = request.getSession().getAttribute("userId");
        if(userId != null) {
            BaseContext.setCurrentId((Long) userId);
            filterChain.doFilter(request,response);
            return;
        }
        //5、如果未登录则返回未登录结果，通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));


        return;
    }

    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            if(PATH_MATCHER.match(url,requestURI)){
                return true;
            }
        }
        return false;
    }
}
